optee-os: Fix compile with GCC 10

Adds a patch to fix compiles with GCC 10 due to the way that libgcc
detects LSE support using __getauxval().

V2: Incorporate patch changes suggested by upstream

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>